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patent pool

n. (context legal English) A consortium of at least two company which agree to cross-license patents relating to a particular technology, often to avoid the problem of blocking patents.

Wikipedia
Patent pool

In patent law, a patent pool is a consortium of at least two companies agreeing to cross-license patents relating to a particular technology. The creation of a patent pool can save patentees and licensees time and money, and, in case of blocking patents, it may also be the only reasonable method for making the invention available to the public. Competition law issues are usually important when a large consortium is formed.